State and draw three convenient rays for image formation by convex lens.
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A ray emanating from the object parallel to the principal axis of the lens after refraction passes through the second principal focus F (in a convex lens) or appears to diverge (in a concave lens) from the first principal focus F.
A ray of light, passing through the optical centre of the lens, emerges without any deviation after refraction.
A ray of light passing through the first principal focus (for a convex lens) or appearing to meet at it (for a concave lens) emerges parallel to the principal axis after refraction.
Explanation:
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